is this documented somewhere? I had checked for this recently, for example in the pricing faq: https://localbitcoins.com/cash_exchange_howto#howto_pricing, but couldn't find it.

• Selling equation: (mtgoxEUR_ask + intrsngEUR_ask + EUR_24h ) / 3 * 1.05
• Selling equation #2: max(max(mtgoxUSD, bitstampUSD), USD_24h)
• Buying equation: (mtgoxEUR_low + intrsngEUR_low + EUR_24h ) / 3

As parameters you can use any currency averages from bitcoincharts.com, for example USD_30d, EUR_24h, SEK_7d. Also market data can be used by combining the market like mtgoxUSD and a parameter like ask, bid, low, high and close.